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Alternative terms for free software, such as open source, FOSS, and FLOSS, have been a controversial issue among free software users from the late 1990s onwards. Coined in 1983 by Richard Stallman, "free software" is used to describe software which can be used, modified, and redistributed with little or no restriction. These freedoms are formally described in The Free Software Definition, first published in February 1986.
Alternatives for "free software" were sought for marketing purposes and because of a perceived "moralising and confrontational" attitude that had been associated with the term.[by whom?] In addition, the "available at no cost" ambiguity of the word "free" was seen as discouraging business adoption. In a 1998 strategy session in California, "open source software" was selected by Todd Anderson, Larry Augustin, Jon Hall, Sam Ockman, Christine Peterson, and Eric S. Raymond. Richard Stallman had not been invited. The session was arranged in reaction to Netscape's January 1998 announcement of a source code release for Navigator (as Mozilla). Those at the meeting described "open source" as a "replacement label" for free software  and Open Source Initiative was soon-after founded by Eric Raymond and Bruce Perens to promote the term as part of "a marketing program for free software". Stallman and others object to the term "open source software" because it does not make people think of the freedom that the software in question gives users, or guarantee it (a minority of open source software is released under a non-liberal license).
Each of the terms "free software" and "open source software" has fans and critics. Partly because of the failure to adopt one specific term, other terms have been proposed. These include "Software Libre" (or libre software), "FLOSS" (Free/Libre/Open Source Software), and "FOSS" (or F/OSS, Free and Open Source Software). These terms share almost identical licence criteria and development practices.
FOSS and F/OSS
The first known use of the phrase "free open source software" on Usenet was in a posting on 18 March 1998, just a month after the term "open source" itself was coined. In February 2002, "F/OSS" appeared on a Usenet newsgroup dedicated to Amiga video games. In early 2002, MITRE used the term "FOSS" in what would later be their 2003 report Use of Free and Open Source Software (FOSS) in the U.S. Department of Defense.
"Software Libre" was first used publicly in 2000, by the European Commission. The word "libre", borrowed from the Spanish and French languages, means having liberty. This avoids the freedom/cost ambiguity of the English word "free".
"FLOSS" was used in 2001 as a project acronym by Rishab Aiyer Ghosh for free/libre/open source software. Later that year, the European Commission (EC) used the phrase when they funded a study on the topic.
Unlike "libre software", which aimed to solve the ambiguity problem, "FLOSS" aimed to avoid taking sides in the debate over whether it was better to say "free software" or to say "open source software".
Proponents of the term point out that parts of the FLOSS acronym can be translated into other languages, with for example the "F" representing free (English) or frei (German), and the "L" representing libre (Spanish or French), livre (Portuguese), or libero (Italian), and so on. However, this term is not often used in official, non-English, documents, since the words in these languages for "free as in freedom" do not have the ambiguity problem of English's "free".
Richard Stallman endorses the term FLOSS to refer to "open source" and "free software" without necessarily choosing between the two camps, however, he asks people to consider supporting the "free software" camp. Stallman has suggested that the term "unfettered software" would be an appropriate, non-ambiguous replacement, but that he would not push for it because there was too much momentum and too much effort behind the term "free software".
Ownership and attachments
None of these terms, or the term "free software" itself, have been trademarked. Bruce Perens of OSI attempted to register "open source" as a service mark for OSI in the United States of America, but that attempt failed to meet the relevant trademark standards of specificity. OSI claims a trademark on "OSI Certified", and applied for trademark registration, but did not complete the paperwork. The United States Patent and Trademark Office labels it as "abandoned".
While the term "free software" is associated with FSF's definition, and the term "open source software" is associated with OSI's definition, the other terms have not been claimed by any group in particular. FSF's and OSI's definitions are worded quite differently but, the latter was based on FSF's definition and the set of software that they cover is almost identical.
All of the terms are used interchangeably, the choice of which to use is mostly political (wanting to support a certain group) or practical (thinking that one term is the clearest).
The choice of term has little or no impact on which licences are valid. The vast majority of software referred to by these terms is distributed under a small set of licences, all of which are unambiguously accepted by the various de facto and de jure guardians of each of these terms. 50-70% of this software is under the GNU General Public License, and most of the rest is distributed under the terms of the GNU Lesser General Public License, the BSD licenses, the Mozilla Public License, the MIT License, and the Apache License, each with a share of between 2% and 10%.
Apart from these two organisations, the Debian project is seen by some to provide useful advice on whether particular licences comply with their Debian Free Software Guidelines. Debian does not publish a list of "approved" licences, but its judgments can be tracked by checking what licences are used by software they have allowed into their distribution. In addition, the Fedora Project does provide a list of approved licences (for Fedora) based on approval of the Free Software Foundation (FSF), the Open Source Initiative (OSI), and consultation with Red Hat Legal.
Richard Stallman's Free Software Definition, adopted by the Free Software Foundation (FSF), defines free software as a matter of liberty, not price. The earliest known publication of the definition of his free software idea was in the February 1986 edition of the FSF's now-discontinued GNU's Bulletin publication. The canonical source for the document is in the philosophy section of the GNU Project website. As of April 2008, it is published there in 39 languages.
The Open Source Definition is used by the Open Source Initiative to determine whether a software license qualifies for the organization's insignia for open source software. The definition was based on the Debian Free Software Guidelines, written and adapted primarily by Bruce Perens. Perens did not base his writing on the four freedoms of free software from the Free Software Foundation, which were only later available on the web.
The first known use of the phrase free open source software on Usenet was in a posting on 18 March 1998, just a month after the term open source itself was coined. In February 2002, F/OSS appeared on a Usenet newsgroup dedicated to Amiga computer games. In early 2002, MITRE used the term FOSS in what would later be their 2003 report Use of Free and Open Source Software (FOSS) in the U.S. Department of Defense.
The acronym FLOSS was coined in 2001 by Rishab Aiyer Ghosh for free/libre/open-source software. Later that year, the European Commission (EC) used the phrase when they funded a study on the topic.
Unlike libre software, which aimed to solve the ambiguity problem, FLOSS aimed to avoid taking sides in the debate over whether it was better to say "free software" or to say "open-source software".
Proponents of the term point out that parts of the FLOSS acronym can be translated into other languages, with for example the F representing free (English) or frei (German), and the L representing libre (Spanish or French), livre (Portuguese), or libero (Italian), liber (Romanian) and so on. However, this term is not often used in official, non-English, documents, since the words in these languages for free as in freedom do not have the ambiguity problem of free in English.
The terms "FLOSS" and "FOSS" have come under some criticism for being counterproductive and sounding silly. For instance, Eric Raymond, co-founder of the Open Source Initiative, has stated:
"Near as I can figure ... people think they’d be making an ideological commitment ... if they pick 'open source' or 'free software'. Well, speaking as the guy who promulgated 'open source' to abolish the colossal marketing blunders that were associated with the term 'free software', I think 'free software' is less bad than 'FLOSS'. Somebody, please, shoot this pitiful acronym through the head and put it out of our misery."
Raymond quotes programmer Rick Moen as stating:
"I continue to find it difficult to take seriously anyone who adopts an excruciatingly bad, haplessly obscure acronym associated with dental hygiene aids" and "neither term can be understood without first understanding both free software and open source, as prerequisite study."
Dualism of FOSS
The primary difference between free software and open source is one of philosophy. According to the Free Software Foundation, "Nearly all open source software is free software. The two terms describe almost the same category of software, but they stand for views based on fundamentally different values."
Thus, the Open Source Initiative considers many free software licenses to also be open source. These include the latest versions of the FSF's three main licenses, the GPL, the Lesser General Public License (LGPL), and the GNU Affero General Public License (AGPL).
Public domain software
There is also a class of software that is covered by the names discussed in this article, but which doesn't have a licence: software for which the source code is in the public domain. The use of such source code, and therefore the executable version, is not restricted by copyright and therefore does not need a free software licence to make it free software. However, not all countries have this form of "public domain" regime.
Further, for distributors to be sure that software is released into the public domain, the usually need to see something written to confirm this. Thus even without a licence, a written note about lack of copyright restrictions often still exists and this could be compared to a form of licence.
Non-English terms in anglophone regions
The free software community in India sometimes uses the term "Swatantra software" since the term "Swatantra" means free in Sanskrit, which is the ancestor of all Indo-European Languages of India, including Hindi, despite English being the lingua franca.
In The Philippines, "malayang software" is sometimes used. The word "libre" exists in the Filipino language, and it came from the Spanish language, but has acquired the same cost/freedom ambiguity of the English word "free".
- "GNU's Bulletin, Volume 1 Number 1, page 8".
- "History of OSI". "conferees decided it was time to dump the moralizing and confrontational attitude that had been associated with "free software" in the past and sell the idea strictly on the same pragmatic, business-case grounds"
- "Goodbye, "free software"; hello, "open source"". "The problem with it is twofold. First, ... the term "free" is very ambiguous ... Second, the term makes a lot of corporate types nervous."
- Michael Tiemann (2006-09-19). "History of the OSI". "The people present included Todd Anderson, Chris Peterson (of the Foresight Institute), John "maddog" Hall and Larry Augustin (both of Linux International), Sam Ockman (of the Silicon Valley Linux User's Group), Michael Tiemann, and Eric Raymond."
- "The Saint of Free Software (page 2)". "Stallman hadn't been invited to the first such gathering of "open source" leaders, a "free software summit" held in April..."
- Eric Raymond. "Goodbye, "free software"; hello, "open source"". "we have a problem with the term "free software" ... we came up with a replacement label we all liked: "open source"."
- "Frequently Asked Questions". Open Source Initiative. Archived from the original on April 23, 2006. "How is "open source" related to "free software"? The Open Source Initiative is a marketing program for free software."
- "Posting re "free open source software", 18 March 1998.".
- "using m$ products is supporting them :(".
- "European Working Group on Software Libre".
- "Free/Libre and Open Source Software: Survey and Study".
- "Free/Libre and Open Source Software and Open Standards in South Africa: A Critical Issue for Addressing the Digital Divide". National Advisory Council on Innovation.
- "FLOSS deployment in Extremadura, Spain".
- "Relatório da ONU aponta o Software Livre (FLOSS) como melhor".
- "Interview with Richard Stallman, Edinburgh, 2004". Free Software Foundation.
- "Trademark Electronic Search System (TESS)". "(Direct link not possible, site search required) Word Mark: OSI CERTIFIED ... Goods and Services: (ABANDONED) IC A . US A . G & S: software licensed under open source licenses. ... Serial Number: 76020694 ... Owner: (APPLICANT) Open Source Initiative ... Live/Dead Indicator: DEAD"
- FSF. "Why "Open Source" misses the point of Free Software". "Nearly all open source software is free software; the two terms describe almost the same category of software."
- "Make Your Open Source Software GPL-Compatible. Or Else.".
- "License information". Debian.
- "Licensing". Fedora.
- "GNU.org". GNU.org. 20 September 2011. Retrieved 23 October 2011.
- "The Free Software Definition – Translations of this page". GNU.org.
- "The Open Source Definition by Bruce Perens"., Open Sources: Voices from the Open Source Revolution, January 1999, ISBN 1-56592-582-3
- "The Open Source Definition"., The Open Source Definition according to the Open Source Initiative
- "Slashdot.org". News.slashdot.org. 16 February 2009. Retrieved 23 October 2011.
- "Posting re "free open source software", 18 March 1998.".
- "Using m$ products is supporting them :(".
- "FLOSS deployment in Extremadura, Spain".
- Please forget to FLOSS Armed and Dangerous, 26 March 2009
- Stallman, Richard. "Why Open Source misses the point of Free. Software". Free Software Foundation. Retrieved 23 October 2011.
- "Licenses by Name". Open Source License. Open Source Initiative. Retrieved 23 October 2011.
- "FSF-India's homepage". "Think of it as swatantra software"
- "Re: Free Software, some thoughts". "My suspicion is that if RMS were Filipino, he would have used Malayang Software to avoid the confusion regarding economics v. liberty."
- Hancock, Terry. "The Jargon of Freedom: 60 Words and Phrases with Context" Free Software Magazine. 2010-20-24
- Berry, D M (2004). The Contestation of Code: A Preliminary Investigation into the Discourse of the Free Software and Open Software Movement, Critical Discourse Studies, Volume 1(1).
- Differences between open source and free software as interpreted by Slackware
- EU study which, among other things, polled developers about terminology at the Wayback Machine (archived May 24, 2009)
- FreeOpenSourceSoftware.org Wiki (same as FreeLibreOpenSourceSoftware.org)
- FSF's suggested translations of free software to languages other than English
- John Stanforth, an Open Source proponent, on the differences between the Open Source Initiative and the Free Software Foundation.